Are you using HipChat Server or Data Center? If so you can follow the instructions on this page to decrypt and expand the export:
If you're a *.hipchat.com (Cloud) user, you'll have to contact support to be able to obtain 1:1 chat data:
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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